Question

Sixty percent out of one hundred percent are boys. There are twenty girls. So what is the number of boys?

please answer step by step explanation.... please.........​

Answer 1

20 = 40 pc
x = 60 pc


Cross multiplication

40x = 60 x 20
x= 1200/40
x = 30

x is the number of boys

Answer 2

It means that the percentage of girls is 40%.(100 - 60= 40)

let no. of total students = x

so, no. of girls= no. of total students* percentage of girls/100

20 = x* 40/ 100

x = 20*100/40

x = 50

total no of students = 50

no. of girls = 20

number of boys = 30